WhenToBird

Buteo regalis · Accipitridae

When Do Ferruginous Hawks Arrive in Wyoming?

Adult Ferruginous Hawk
Photo: ayden, CC BY 4.0 via iNaturalist

Ferruginous Hawks are winter birds in Wyoming: the first arrive in late January, they are common by early March, peak in early October (1.1% of checklists), and most are gone by late December.

When to look

First arrivalsJan 22-31late January
Common byMar 1-7early March
PeakOct 1-7early October
Most gone byDec 22-31late December

Best: early October. First arrivals late January; most are gone by late December. Peak: on about 1.1% of Wyoming checklists.

  1. Jancommon
  2. Febcommon
  3. Marcommon
  4. Aprpeak season
  5. Maycommon
  6. Juncommon
  7. Julpeak season
  8. Augpeak season
  9. Seppeak season
  10. Octpeak season
  11. Novcommon
  12. Deccommon

Darker months: more checklists report it. Outlined: peak month.

0%0.5%1%1.5%Jan 1-7: 0.6% of 2543 checklistsJan 8-14: 0.2% of 2114 checklistsJan 15-21: 0.7% of 1984 checklistsJan 22-31: 0.4% of 2605 checklistsFeb 1-7: 0.5% of 1940 checklistsFeb 8-14: 0.6% of 1954 checklistsFeb 15-21: 0.4% of 2575 checklistsFeb 22-28: 0.3% of 1932 checklistsMar 1-7: 0.7% of 2486 checklistsMar 8-14: 0.7% of 2535 checklistsMar 15-21: 0.7% of 2726 checklistsMar 22-31: 0.8% of 4349 checklistsApr 1-7: 0.7% of 3300 checklistsApr 8-14: 0.6% of 3500 checklistsApr 15-21: 0.8% of 3701 checklistsApr 22-30: 1.0% of 5887 checklistsMay 1-7: 0.7% of 5341 checklistsMay 8-14: 0.4% of 6910 checklistsMay 15-21: 0.6% of 6884 checklistsMay 22-31: 0.5% of 10652 checklistsJun 1-7: 0.6% of 6807 checklistsJun 8-14: 0.7% of 6714 checklistsJun 15-21: 0.5% of 6708 checklistsJun 22-30: 0.6% of 8160 checklistsJul 1-7: 0.5% of 5755 checklistsJul 8-14: 0.6% of 5379 checklistsJul 15-21: 0.6% of 5299 checklistsJul 22-31: 0.8% of 6830 checklistsAug 1-7: 1.1% of 4581 checklistsAug 8-14: 1.1% of 4625 checklistsAug 15-21: 0.7% of 4466 checklistsAug 22-31: 1.0% of 6562 checklistsSep 1-7: 0.9% of 4543 checklistsSep 8-14: 0.9% of 4652 checklistsSep 15-21: 1.0% of 4186 checklistsSep 22-30: 1.2% of 5301 checklistsOct 1-7: 0.9% of 3248 checklistsOct 8-14: 1.1% of 3010 checklistsOct 15-21: 0.8% of 2624 checklistsOct 22-31: 0.8% of 3170 checklistsNov 1-7: 0.9% of 2110 checklistsNov 8-14: 0.7% of 2153 checklistsNov 15-21: 0.7% of 1971 checklistsNov 22-30: 0.7% of 2136 checklistsDec 1-7: 0.4% of 1646 checklistsDec 8-14: 0.9% of 1609 checklistsDec 15-21: 0.9% of 1954 checklistsDec 22-31: 0.5% of 2392 checklistsJanFebMarAprMayJunJulAugSepOctNovDec
Share of complete checklists reporting it, by week (4 per month). Grey bars: fewer than 10 checklists, not counted.

Frequency is the share of complete checklists in Wyoming that listed the bird, 2016–2025. It is not a head count, and it follows where and when people go birding. How to read it.

JanFebMarAprMayJunJulAugSepOctNovDec
today
Second week of November

Each county is shaded by the share of complete checklists there that listed the bird, blended with the weeks either side. Darker is more often. It follows where people watch birds, not how many birds there are. How to read it.

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Where in Wyoming

Best counties

Share of checklists at the peak
  1. Goshen CountyBest early December · 31 checklists that week, 1,920 in all12%
  2. Niobrara CountyBest mid July · 19 checklists that week, 423 in all5.6%
  3. Sweetwater CountyBest the second week of August · 136 checklists that week, 5,064 in all4.9%
  4. Carbon CountyBest late April · 210 checklists that week, 6,429 in all4.9%
  5. Albany CountyBest the second week of October · 409 checklists that week, 21,857 in all4.6%
  6. Weston CountyBest the second week of November · 15 checklists that week, 2,297 in all3.5%

Best spots

Share of checklists at the peak
  1. Hutton Lake National Wildlife RefugeAlbany County, best late September · 23 checklists that week, 936 in all49%
  2. Lake Hattie ReservoirAlbany County, best mid September · 22 checklists that week, 476 in all21%
  3. Twin Buttes LakeAlbany County, best late October · 33 checklists that week, 405 in all5.6%
  4. Saratoga LakeCarbon County, best the second week of June · 20 checklists that week, 626 in all3.4%
  5. Meeboer LakeAlbany County, best late April · 23 checklists that week, 300 in all3.3%

Busy spots report more of everything; compare the checklist counts before you drive anywhere.

Best time of day

In Wyoming, the Ferruginous Hawk is most often listed on checklists started between 1 and 3 pm (0.8% of those checklists).

0%0.5%1%12 am: too few checklists (59) to judge1 am: too few checklists (76) to judge2 am: too few checklists (86) to judge3 am: too few checklists (79) to judge4 am: too few checklists (326) to judge5 am: too few checklists (2271) to judge6 am: 0.6% of 8808 checklists7 am: 0.7% of 18458 checklists8 am: 0.7% of 22143 checklists9 am: 0.8% of 21499 checklists10 am: 0.8% of 19425 checklists11 am: 0.7% of 16017 checklists12 pm: 0.7% of 13868 checklists1 pm: 0.8% of 12984 checklists2 pm: 0.9% of 12605 checklists3 pm: 0.7% of 11821 checklists4 pm: 0.7% of 10571 checklists5 pm: 0.6% of 8746 checklists6 pm: 0.5% of 6707 checklists7 pm: 0.5% of 4890 checklists8 pm: too few checklists (2323) to judge9 pm: too few checklists (554) to judge10 pm: too few checklists (134) to judge11 pm: too few checklists (59) to judge12a3a6a9a12p3p6p9p
Share of checklists started in each local hour that reported it. It reflects when people go birding as well as when birds are active. Grey hours have too few checklists (under 2% of the state’s, or under 200) to judge.
Week-by-week table
MonthDays 1-78-1415-2122-end
January0.6%0.2%0.7%0.4%
February0.5%0.6%0.4%0.3%
March0.7%0.7%0.7%0.8%
April0.7%0.6%0.8%1.0%
May0.7%0.4%0.6%0.5%
June0.6%0.7%0.5%0.6%
July0.5%0.6%0.6%0.8%
August1.1%1.1%0.7%1.0%
September0.9%0.9%1.0%1.2%
October0.9%1.1%0.8%0.8%
November0.9%0.7%0.7%0.7%
December0.4%0.9%0.9%0.5%

Neighboring states

  • Colorado: arrives early October, 15 weeks earlier than Wyoming
  • Utah: arrives early October, 15 weeks earlier than Wyoming
  • South Dakota: arrives late August, 20 weeks earlier than Wyoming
  • North Dakota: arrives the second week of March, 6 weeks later than Wyoming

Common questions

When do Ferruginous Hawks arrive in Wyoming?
Ferruginous Hawks are winter birds in Wyoming: the first arrive in late January, they are common by early March, peak in early October (1.1% of checklists), and most are gone by late December.
When do Ferruginous Hawks leave Wyoming?
Most Ferruginous Hawks have left Wyoming by late December, when reports fall below half their usual rate. Stragglers are still reported until the second week of January.
When is the best time to see a Ferruginous Hawk in Wyoming?
The Ferruginous Hawk is reported most often in early October, on about 1.1% of Wyoming checklists.
Where in Wyoming are Ferruginous Hawks seen most often?
By county, Goshen County, Niobrara County, and Sweetwater County have the highest peak reporting rates for the Ferruginous Hawk (counties with at least 200 checklists).